Folder reorganize 1
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Rucus
309
includes/alerts.php
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309
includes/alerts.php
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<?php
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/**
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* System-wide alerts include
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*
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* Include this file in data pages to display conditional alerts.
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* Expects $value array to be populated from items.php or shared endpoint.
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*
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* Usage: require __DIR__ . '/../includes/alerts.php';
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*/
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$alerts = [];
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// ============================================================================
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// Database Connection for Alerts (singleton)
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// ============================================================================
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function getAlertConnection() {
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static $connection = null;
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if ($connection === null) {
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$connection = mysqli_connect('192.168.0.16', 'lasucaai', 'is413#dfslw', 'controls');
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if ($connection) {
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mysqli_set_charset($connection, 'utf8mb4');
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// Create tables if not exists
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$createLogTable = "CREATE TABLE IF NOT EXISTS alert_log (
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id INT AUTO_INCREMENT PRIMARY KEY,
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alert_type VARCHAR(50) NOT NULL,
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alert_tag VARCHAR(100) NOT NULL,
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alert_value DECIMAL(18,4) NULL,
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threshold_value DECIMAL(18,4) NULL,
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alert_message VARCHAR(500) NOT NULL,
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source_page VARCHAR(255) NULL,
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logged_at DATETIME DEFAULT CURRENT_TIMESTAMP,
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INDEX idx_alert_type (alert_type),
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INDEX idx_alert_tag (alert_tag),
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INDEX idx_logged_at (logged_at)
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)";
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mysqli_query($connection, $createLogTable);
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// Create throttle table to track last log time per alert
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$createThrottleTable = "CREATE TABLE IF NOT EXISTS alert_throttle (
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alert_key VARCHAR(150) PRIMARY KEY,
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last_logged DATETIME NOT NULL,
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INDEX idx_last_logged (last_logged)
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)";
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mysqli_query($connection, $createThrottleTable);
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// Create condition state table to track duration
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$createStateTable = "CREATE TABLE IF NOT EXISTS alert_condition_state (
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alert_key VARCHAR(150) PRIMARY KEY,
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condition_started DATETIME NOT NULL,
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last_seen DATETIME NOT NULL,
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INDEX idx_last_seen (last_seen)
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)";
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mysqli_query($connection, $createStateTable);
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}
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}
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return $connection;
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}
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// ============================================================================
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// Check if condition has persisted for required duration (in seconds)
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// Returns true if condition has been active for >= duration seconds
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// ============================================================================
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function checkAlertDuration($alertKey, $conditionMet, $durationSeconds = 0) {
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if ($durationSeconds <= 0) {
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// No duration requirement - trigger immediately
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return $conditionMet;
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}
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$conn = getAlertConnection();
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if (!$conn) {
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return $conditionMet; // Fallback to immediate if no DB
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}
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$now = date('Y-m-d H:i:s');
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if ($conditionMet) {
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// Condition is currently true - check/update state
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$stmt = mysqli_prepare($conn,
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"SELECT condition_started FROM alert_condition_state WHERE alert_key = ?"
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);
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if ($stmt) {
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mysqli_stmt_bind_param($stmt, 's', $alertKey);
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mysqli_stmt_execute($stmt);
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$result = mysqli_stmt_get_result($stmt);
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$row = mysqli_fetch_assoc($result);
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mysqli_stmt_close($stmt);
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if ($row) {
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// Condition already being tracked - update last_seen
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$updateStmt = mysqli_prepare($conn,
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"UPDATE alert_condition_state SET last_seen = ? WHERE alert_key = ?"
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);
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if ($updateStmt) {
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mysqli_stmt_bind_param($updateStmt, 'ss', $now, $alertKey);
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mysqli_stmt_execute($updateStmt);
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mysqli_stmt_close($updateStmt);
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}
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// Check if duration has been met
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$started = strtotime($row['condition_started']);
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$elapsed = time() - $started;
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return $elapsed >= $durationSeconds;
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} else {
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// First time seeing this condition - start tracking
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$insertStmt = mysqli_prepare($conn,
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"INSERT INTO alert_condition_state (alert_key, condition_started, last_seen)
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VALUES (?, ?, ?)"
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);
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if ($insertStmt) {
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mysqli_stmt_bind_param($insertStmt, 'sss', $alertKey, $now, $now);
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mysqli_stmt_execute($insertStmt);
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mysqli_stmt_close($insertStmt);
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}
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return false; // Just started, duration not met yet
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}
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}
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} else {
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// Condition is false - clear the tracking state
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$deleteStmt = mysqli_prepare($conn,
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"DELETE FROM alert_condition_state WHERE alert_key = ?"
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);
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if ($deleteStmt) {
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mysqli_stmt_bind_param($deleteStmt, 's', $alertKey);
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mysqli_stmt_execute($deleteStmt);
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mysqli_stmt_close($deleteStmt);
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}
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return false;
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}
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return $conditionMet;
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}
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// ============================================================================
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// Alert Logging Function (throttled to once per minute per alert)
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// ============================================================================
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function logAlert($alertType, $alertTag, $alertValue, $alertMessage, $threshold = null) {
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$conn = getAlertConnection();
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if (!$conn) {
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return;
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}
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try {
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// Check throttle - only log once per minute per alert type+tag
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$alertKey = $alertType . ':' . $alertTag;
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$throttleCheck = mysqli_prepare($conn,
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"SELECT last_logged FROM alert_throttle
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WHERE alert_key = ? AND last_logged > DATE_SUB(NOW(), INTERVAL 1 MINUTE)"
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);
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if ($throttleCheck) {
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mysqli_stmt_bind_param($throttleCheck, 's', $alertKey);
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mysqli_stmt_execute($throttleCheck);
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$result = mysqli_stmt_get_result($throttleCheck);
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$recentLog = mysqli_fetch_assoc($result);
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mysqli_stmt_close($throttleCheck);
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if ($recentLog) {
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return; // Skip - already logged within last minute
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}
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}
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// Log the alert
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$sourcePage = $_SERVER['PHP_SELF'] ?? 'unknown';
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$stmt = mysqli_prepare($conn,
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"INSERT INTO alert_log (alert_type, alert_tag, alert_value, threshold_value, alert_message, source_page)
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VALUES (?, ?, ?, ?, ?, ?)"
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);
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if ($stmt) {
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mysqli_stmt_bind_param($stmt, 'ssddss',
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$alertType,
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$alertTag,
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$alertValue,
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$threshold,
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$alertMessage,
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$sourcePage
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);
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mysqli_stmt_execute($stmt);
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mysqli_stmt_close($stmt);
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// Update throttle timestamp
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$throttleUpdate = mysqli_prepare($conn,
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"INSERT INTO alert_throttle (alert_key, last_logged) VALUES (?, NOW())
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ON DUPLICATE KEY UPDATE last_logged = NOW()"
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);
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if ($throttleUpdate) {
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mysqli_stmt_bind_param($throttleUpdate, 's', $alertKey);
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mysqli_stmt_execute($throttleUpdate);
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mysqli_stmt_close($throttleUpdate);
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}
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}
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} catch (Exception $e) {
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// Silent fail - logging should never break the page
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error_log('Alert logging failed: ' . $e->getMessage());
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}
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}
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// ============================================================================
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// Alert Definitions (Now managed via alerts-admin.php)
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// ============================================================================
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// All alerts are now loaded from the alert_definitions table below.
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// Use the admin panel at /alerts-admin.php to add, edit, or disable alerts.
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// ============================================================================
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// Database-Driven Alerts (from alerts-admin.php)
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// ============================================================================
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$alertConn = getAlertConnection();
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if ($alertConn) {
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$defResult = mysqli_query($alertConn,
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"SELECT * FROM alert_definitions WHERE is_active = 1"
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);
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if ($defResult) {
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while ($def = mysqli_fetch_assoc($defResult)) {
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$tagName = $def['tag_name'];
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$tagValue = $value[$tagName] ?? null;
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if ($tagValue === null) {
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continue; // Tag not found in current data
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}
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// Evaluate condition based on comparison operator
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$conditionMet = false;
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$threshold = floatval($def['threshold_value']);
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switch ($def['comparison']) {
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case '<':
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$conditionMet = ($tagValue < $threshold);
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break;
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case '<=':
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$conditionMet = ($tagValue <= $threshold);
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break;
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case '>':
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$conditionMet = ($tagValue > $threshold);
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break;
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case '>=':
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$conditionMet = ($tagValue >= $threshold);
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break;
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case '=':
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$conditionMet = ($tagValue == $threshold);
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break;
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case '!=':
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$conditionMet = ($tagValue != $threshold);
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break;
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}
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// Check duration requirement
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$alertKey = 'db_' . $def['id'] . '_' . $tagName;
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$durationMet = checkAlertDuration($alertKey, $conditionMet, intval($def['duration_seconds']));
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if ($durationMet) {
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// Build message from template
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$alertMessage = str_replace(
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['{value}', '{threshold}', '{tag}'],
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[$tagValue, $threshold, $tagName],
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$def['message_template']
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);
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$alerts[] = [
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'type' => $def['alert_type'],
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'icon' => $def['icon'],
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'tag' => $tagName,
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'value' => $tagValue,
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'threshold' => $threshold,
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'display' => $def['display_alert'],
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'message' => htmlspecialchars($alertMessage, ENT_QUOTES, 'UTF-8')
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];
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logAlert($def['alert_type'], $tagName, $tagValue, $alertMessage, $threshold);
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}
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}
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}
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}
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// ============================================================================
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// Render Alerts (info alerts are logged only, not displayed)
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// ============================================================================
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if (!empty($alerts)) {
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foreach ($alerts as $alert) {
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// Skip info alerts - they are logged but not displayed
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if ($alert['type'] === 'info') {
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continue;
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}
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// Skip alerts with display=0 (database-driven alerts can disable display)
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if (isset($alert['display']) && !$alert['display']) {
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continue;
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}
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$bgColor = '#c62828'; // danger (red)
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if ($alert['type'] === 'warning') {
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$bgColor = '#f57c00'; // warning (orange)
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}
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echo '<tr>';
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echo '<td colspan="4" style="background: ' . $bgColor . '; color: white; text-align: center; font-weight: bold; padding: 10px;">';
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echo $alert['icon'] . ' ' . $alert['message'];
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echo '</td>';
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echo '</tr>';
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}
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}
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